Versatile Mage: My magic power can be doubled

Fan Jian traveled to the world of Full-time Mage. In this world where magic is respected and demons are rampant, he became a weak water mage in the early stage!
Until he released magic and found out... his magic power would double? !
I released one water guard for myself and it became three?
It doubles with each advancement? !
Fan Jian smiled frivolously: "Did you guys not eat? How come you can't even break my defense?!"
Who dares to say that the water system is weak? I'll give you a dozen catastrophe water whistles to wash you off!
At the horizon, huge waves like mountains slammed down violently...
In this way, except for the water system, other systems also embarked on a road of no return...
Passerby A: "Didn't they say that the Chaos Vortex has a limit to its endurance?!?"
Passerby B: "Why is his space system killing everyone!"
Passerby C: "Who cares about him? He is going to empty the Thousand Clans Elf Tower!"
...
"The Emperor of the Extreme South, the Deep Sea God Clan, and the Demon Empire want to invade our Chinese territory?"
Fan Jian: "Let me see what's going on?!"
ps: The introduction is weak, please read the main text!